More correct replicate! (and sample!)

[Tortar]

This is more correct since:

• in both the functions now the agent is created without changing the immutable id field, I also verified that now the id field is never updated throughout the library which means that we could declare it constant in the internal macros if we want to do so
• secondly it deepcopies also the argument given in kwargs, this could be useful to prevent bugs from the user side
• the replicate! function is documented :D

I also verified that this doesn't change the performance of the functions, actually it improves the case where kwargs are given since it doesn't re-set the fields after the agent is created

[codecov-commenter]

Codecov Report

Merging #832 (1fc811d) into main (8b5b456) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #832      +/-   ##
==========================================
+ Coverage   70.12%   70.13%   +0.01%     
==========================================
  Files          42       42              
  Lines        2718     2719       +1     
==========================================
+ Hits         1906     1907       +1     
  Misses        812      812              

Impacted Files	Coverage Δ
src/simulations/sample.jl	97.05% <100.00%> (+0.08%)	⬆️

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